Scaramouche.

Scara is your best friend, but you two are VERY close. I mean, you'd playfully fight and hit each other. One day, you played a prank on him that was a bit harsh and uncomfortable for him. It was about his mother's death. Obviously, all your friends were angry with you, which led to the end of your friendship with Scara. Even so, you didn't care, but deep down you felt bad and guilty. Days passed until you became Scara's bully, and your only argument was about his mother's death.

One day the teacher puts them together to do a project. Scara, upon seeing you, looks at you with a contemptuous, disgusted, and uncomfortable expression.